• 대한치과교정학회지
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• 제46권5호
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• pp.290-300
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• 2016

Objective: This study aimed to (1) evaluate the effects of maxillary second and third molar eruption status on the distalization of first molars with a modified palatal anchorage plate (MPAP), and (2) compare the results to the outcomes of the use of a pendulum and that of a headgear using three-dimensional finite element analysis. Methods: Three eruption stages were established: an erupting second molar at the cervical one-third of the first molar root (Stage 1), a fully erupted second molar (Stage 2), and an erupting third molar at the cervical one-third of the second molar root (Stage 3). Retraction forces were applied via three anchorage appliance models: an MPAP with bracket and archwire, a bone-anchored pendulum appliance, and cervical-pull headgear. Results: An MPAP showed greater root movement of the first molar than crown movement, and this was more noticeable in Stages 2 and 3. With the other devices, the first molar showed distal tipping. Transversely, the first molar had mesial-out rotation with headgear and mesial-in rotation with the other devices. Vertically, the first molar was intruded with an MPAP, and extruded with the other appliances. Conclusions: The second molar eruption stage had an effect on molar distalization, but the third molar follicle had no effect. The application of an MPAP may be an effective treatment option for maxillary molar distalization.

• 대한치과교정학회지
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• 제46권1호
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• pp.55-61
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• 2016

Skeletal anchorage-assisted upper molar distalization has become one of the standard treatment modalities for the correction of Class II malocclusion. The purpose of this study was to analyze maxillary molar movement patterns according to appliance design, with the simultaneous use of buccal fixed orthodontic appliances. The authors devised two distinct types of midpalatal miniscrew-assisted maxillary molar distalizers, a lingual arch type and a pendulum type. Fourteen patients treated with one of the two types of distalizers were enrolled in the study, and the patterns of tooth movement associated with each type were compared. Pre- and post-treatment lateral cephalograms were analyzed. The lingual arch type was associated with relatively bodily upper molar distalization, while the pendulum type was associated with distal tipping with intrusion of the upper molar. Clinicians should be aware of the expected tooth movement associated with each appliance design. Further well designed studies with larger sample sizes are required.

• 대한치과교정학회지
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• 제41권1호
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• pp.36-41
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• 2011

Objective: The aim of this study was to measure tumor necrosis factor-${\alpha}$ (TNF-${\alpha}$) levels around miniscrews used for anchorage during a 3-month period of canine distalization. Methods: Sixteen patients (8 boys, 8 girls; mean age, $16.6{\pm}2.4$ years) whose upper first premolars were extracted for orthodontic treatment were included in this study. Miniscrews were used as an anchorage unit in canine distalization. Thirty-two (32) miniscrew implants were placed bilaterally in the alveolar bone between the maxillary second premolars and first molars. The treatment, miniscrew, and control groups comprised upper canines, miniscrew implants, and upper first premolars, respectively. Peri-miniscrew implant crevicular fluid and gingival crevicular fluid were obtained before applying force and at 1, 24, and 48 hours, and at 7 and 21 days, and 3 months after applying force. Results: During the 3-month period, the (TNF-${\alpha}$) levels increased significantly at 24 hours only in the treatment group (p < 0.01). In the miniscrew and control groups, there were no statistically Significant changes. No significant differences were observed between groups. Conclusions: Miniscrews can be conveniently used for anchorage in orthodontics.

• 대한치과의사협회지
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• 제57권6호
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• pp.326-332
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• 2019

Extraction treatment has been used for a long time to treat crowding or lip protrusion patients and still extraction decision is the most difficult and important decision during diagnosis and treatment planning. If the amount of crowidng is severe, premolar extraction is often considered. Because of their location, premolar extractions would seem to allow for the most straightforward relief of crowding and the improvement of soft tissue profile. But patients and their parents often prefer nonextraction approach if possible and such a preference gives us serious question about the boundary of nonextraction treatment. Because Orthodontic Mini-Implant (OMI) become popular these days, distalization of posterior teeth can be obtained easily without patient's compliance. For this reason, many orthodontists are trying to treat crowding patient with nonextraction than before. But sometime, unexpected side effects are observed including unesthetic profile, impaction of second molar and long treatment time. All the tools for space gaining - extraction, arch expansion, molar distalization and interproximal enamel reduction - have their limitations and indications. Possible side effects and limitations should be carefully considered during the treatment planning. Although Korean patients usually require extraction more often than US or European patients, more knowledge about the tools for space gaining would help us to decrease the rate of extraction and the problems during treatment of crowding patients.

• 대한소아치과학회지
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• 제36권3호
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• pp.464-474
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• 2009

상악 대구치의 원심이동이 요구되는 경우, 구외견인, Wilson distalizing arches, 가철식 스프링 장치 그리고 Schwarz plate-type 장치 등을 사용 할 수 있다. 그러나 이러한 전통적인 대구치의 원심이동 장치들로 치료에 성공하기 위해서는 환자의 협조가 필수적이기 때문에 많은 소아치과 의사들은 환자 의존성을 최소화하고 임상가가 통제 할 수 있는 장치들로 전환하고 있다. 이 중 가장 일반적인 것이 pendulum 장치인데, 고정원이 되는 전방치아의 원하지 않는 이동과 고정원 소실, 그리고 구개부 고정원이 좋지 않은 경우 원하는 정도의 구치부 원심이동을 얻기 어렵다는 단점이 있다. 이와 같은 전통적인 pendulum의 단점을 해결하고자, SAS(Skeletal Anchorage System)를 pendulum에 접목하여 골에서 직접 지지를 얻는 변형된 형태의 pendulum, 즉 bone-supported pendulum을 제작하여 장착 시킨 후 주기적인 관찰을 시행하였다. 본 증례는 혼합치열기 환자를 대상으로 bone-supported pendulum을 사용하여 안정된 고정원 유지, 원치 않는 치아이동의 최소화 및 양호한 상악 대구치 원심이동 등을 관찰하였기에 이를 보고하는 바이다.

• 대한치과교정학회:학술대회논문집
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• 대한치과교정학회 2001년도 제34회 학술대회
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• pp.80.2-80.2
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• 2001

• 대한치과교정학회:학술대회논문집
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• 대한치과교정학회 2002년도 제35회 학술대회
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• pp.29.2-29.2
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• 2002

• 대한치과교정학회:학술대회논문집
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• 대한치과교정학회 2002년도 제35회 학술대회
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• pp.91.2-91.2
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• 2002

• 대한치과교정학회:학술대회논문집
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• 대한치과교정학회 1998년도 제31회 학술대회
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• pp.84.1-84.1
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• 1998

• 대한치과교정학회지
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• 제47권1호
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• pp.59-73
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• 2017

This case report illustrates the successful treatment of a patient with skeletal Class II malocclusion and an unesthetic smile involving excessive gingival display and large buccal corridors. By applying dual buccal interradicular miniscrews, total intrusion of the maxillary dentition along with distalization was induced to improve both the occlusion and smile esthetics. In addition to the conventional cephalometric superimposition, three-dimensional superimposition was performed and evaluated to validate the treatment outcome.